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Protein kinase C activity as a potential marker for colorectal neoplasia

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Abstract

Protein kinase C (PKC) is a mediator of transmembrane signal transduction, important in cell growth and differentiation. Cell activation by extracellular signals is associated with a translocation of PKC from the cytosol to the membrane. We measured and compared PKC activity in cytosol and membrane fractions of normal and neoplastic colorectal tissue. Total and membrane-associated PKC activity in normal colorectal tissue was greater in patients (N=16) with colorectal cancer compared to that from patients with a normal colonoscopy (N=16),P<0.01. A similar trend was noted in PKC activity of normal colorectal tissue from patients with adenomas compared to patients with a normal colonoscopy. PKC activity (total, membrane-associated, percent membrane) was not different in neoplastic colorectal tissue compared to that of adjacent normal tissue. However, there was a considerable range of PKC activity noted in all groups, which would limit the utility of PKC activity as a marker for colorectal neoplasia.

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Authors and Affiliations

  1. From the Department of Medicine, University Hospital, The Milton S. Hershey Medical Center, The Pennsylvania State University, Hershey, Pennsylvania

    Thomas J. McGarrity MD & Laurie P. Peiffer BS

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  1. Thomas J. McGarrity MD
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  2. Laurie P. Peiffer BS
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Supported by grant R29 CA45468 (T.J.M.) from the National Institutes of Health.

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McGarrity, T.J., Peiffer, L.P. Protein kinase C activity as a potential marker for colorectal neoplasia. Digest Dis Sci 39, 458–463 (1994). https://doi.org/10.1007/BF02088328

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  • DOI: https://doi.org/10.1007/BF02088328

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